need to add following in catalog/admin/categories.php

$bundle_count = count($bundle_array)

after following

while ($bundle_contents = tep_db_fetch_array($bundle_query)) {
$bundle_array[] = array('id' => $bundle_contents['subproduct_id'],
'qty' => $bundle_contents['subproduct_qty'],
'name' => $bundle_contents['products_name']);
}

More...